US11843096B2 - Internal resistance detection device and power source device - Google Patents

Internal resistance detection device and power source device Download PDF

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Publication number
US11843096B2
US11843096B2 US17/266,359 US201917266359A US11843096B2 US 11843096 B2 US11843096 B2 US 11843096B2 US 201917266359 A US201917266359 A US 201917266359A US 11843096 B2 US11843096 B2 US 11843096B2
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internal resistance
power storage
storage unit
capacity
unit
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US20210311100A1 (en
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Yuuki Sugisawa
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Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
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Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/64—Testing of capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/005—Detection of state of health [SOH]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to an internal resistance detection device and a power source device.
  • a configuration is known that includes a main power source that is constituted by a lead storage battery or the like, and an auxiliary power source that is constituted by an electric double layer capacitor, a lithium-ion capacitor, or the like.
  • a main power source that is constituted by a lead storage battery or the like
  • an auxiliary power source that is constituted by an electric double layer capacitor, a lithium-ion capacitor, or the like.
  • JP 2008-64700A discloses an internal resistance measuring device that is configured to connect an external resistor in series with an electric double layer capacitor and measure the voltage of both ends of the electric double layer capacitor and the external resistor that are connected in series.
  • voltage drop is made to occur by switching to constant current discharge after the voltage of both ends of the capacitor reaches a predetermined charging voltage.
  • the internal resistance measuring device calculates the internal resistance based on the voltage drop of the end-to-end voltage of the capacitor and the discharge current that flows through the capacitor.
  • the internal resistance measuring device of JP 2008-64700A causes voltage drop when the capacitor is performing charging control and performs processing to calculate the internal resistance. Causing temporary voltage drop during charging control in this manner causes an increase in the time it takes for the capacitor to be charged to the charging target voltage thereof.
  • a configuration is conceivable in which the internal resistance is calculated each time the power source system is initialized before charging control of the capacitor is performed, but this configuration also increases the time it takes until starting normal operations such as charging control. This results in an increase in the time it takes for the capacitor to reach the charging target voltage thereof.
  • the present disclosure was created in order to solve at least one of the problems described above, and an object thereof is to provide a configuration in which the internal resistance of a power storage unit can be efficiently and accurately detected.
  • An internal resistance detection device of a first aspect of the present disclosure is configured to detect an internal resistance of a power storage unit in an in-vehicle power source system that includes a power source unit and the power storage unit configured to be charged based on power from the power source unit, the internal resistance detection device including: a current detection unit configured to detect a current that flows through a predetermined conduction path that is a path with which power is supplied from the power source unit to the power storage unit; a charging circuit unit configured to convert power from the power source unit and to supply charging current to the power storage unit; and an internal resistance detection portion configured to detect an internal resistance of the power storage unit.
  • the charging circuit unit is configured to raise an output voltage to a target voltage by performing constant current operation in which the charging current is output at a target charging current, and, when the output voltage reaches the target voltage, to control power such that the charging current is lowered by performing constant voltage operation in which the output voltage is fixed at the target voltage.
  • the internal resistance detection unit is configured to detect the internal resistance of the power storage unit based on the target charging current, a drop time, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and a capacity of the power storage unit.
  • a power source device includes the power storage unit and the internal resistance detection device.
  • the internal resistance detection unit of the internal resistance detection device described above detects the internal resistance of the power storage unit based on the target charging current during constant current operation by the charging circuit unit, drop time, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and the capacity of the power storage unit. For this reason, the target charging current during constant current operation by the charging circuit unit, drop time, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and the capacity of the power storage unit can be reflected and the internal resistance of the power storage unit can be accurately detected.
  • the internal resistance detection unit detects the internal resistance of the power storage unit based on the drop time and the current that is detected after constant voltage operation is started by the charging circuit unit, and therefore the internal resistance detection unit can use the time of constant voltage operation performed by the charging circuit unit to detect the internal resistance of the power storage unit.
  • the internal resistance detection unit can use the time of constant voltage operation performed by the charging circuit unit to detect the internal resistance of the power storage unit.
  • the internal resistance detection device can detect the internal resistance of the power storage unit efficiently and accurately.
  • the power source device of the second aspect can exhibit effects that are similar to those of the internal resistance detection device of the first aspect.
  • FIG. 1 is a block diagram schematically showing an example of a configuration of an in-vehicle power source system of a first embodiment.
  • FIG. 2 is a graph showing an example of the changes over time of the output voltage of a DC-DC converter and the charging current supplied to the power storage unit in the in-vehicle power source system of the first embodiment.
  • FIG. 3 is a graph showing an example of the changes over time of the output voltage of a DC-DC converter and the charging current supplied to the power storage unit in the in-vehicle power source system of a conventional example.
  • I Ichg ⁇ exp( ⁇ t2/RC), which is a formula of the current detected by the current detection unit when a predetermined amount of time has passed after the charging circuit unit starts constant voltage operation.
  • the internal resistance detection device may also be configured to include a voltage detection unit configured to detect the output voltage of the charging circuit unit.
  • the internal resistance detection device may also be configured to include a capacity detection unit configured to detect the capacity of the power storage unit based on changes in the output voltage detected by the voltage detection unit due to a predetermined capacity detection time passing when the charging circuit unit is performing constant current operation, and the charging current that is detected by the current detection unit while the capacity detection time passes.
  • the internal resistance detection unit may also detect the internal resistance of the power storage unit based on the target charging current, the drop time, and the capacity of the power storage unit detected by the capacity detection unit.
  • the capacity of the power storage unit can be detected by the capacity detection unit based on the change of the output voltage detected by the voltage detection unit and the charging current detected by the current detection unit. For this reason, it is possible to perform capacity detection that is highly accurate and that reflects the state of the power storage unit immediately before detecting the internal resistance thereof. Also, it is possible to more accurately detect the internal resistance of the power storage unit by using the capacity thereof that is precisely detected.
  • An in-vehicle power source system 10 (hereinafter also referred to as “system 10 ”) shown in FIG. 1 is configured as a power source system that supplies power to an in-vehicle load 12 (hereinafter also referred to as “load 12 ”).
  • the system 10 includes a power source unit 11 , an auxiliary power source device 20 , a conduction path 13 , and a switch 14 .
  • the power source unit 11 is the main source of power to be supplied to the load 12 .
  • the auxiliary power source device 20 is a source of power that is different to the power source unit 11 .
  • the conduction path 13 is a path through which power is supplied from the power source unit 11 to the load 12 .
  • the switch 14 is provided on the conduction path 13 .
  • the system 10 supplies power from the power source unit 11 to the load 12 and the auxiliary power source device 20 when the supply of power from the power source unit 11 is normal, and supplies power from the auxiliary power source device 20 to the load 12 and the power source unit 11 when the supply of power from the power source unit 11 has become abnormal.
  • the power source unit 11 may be constituted by a known power storage means such as a lead storage battery, a lithium ion battery, an electric double layer capacitor, a lithium-ion capacitor, or another type power storage unit.
  • the power source unit 11 includes a terminal on the high-potential side that is electrically connected to the conduction path 13 , and applies a predetermined output voltage (12 V, for example) to the conduction path 13 .
  • a terminal on the low-potential side of the power source unit 11 is electrically connected to a ground portion that is provided in the vehicle.
  • the power source unit 11 is electrically connected to a generator (not shown) and can be charged with power from the generator.
  • the auxiliary power source device 20 is equivalent to an example of a power source device, and includes a power storage unit 21 , a conduction path 22 , and an internal resistance detection device 30 .
  • the power storage unit 21 may be constituted by a known capacitor such as an electric double layer capacitor and a lithium-ion capacitor.
  • the power storage unit 21 is configured to be charged based on power from the power source unit 11 .
  • the power storage unit 21 has a terminal on the high-potential side that is electrically connected to the conduction path 22 .
  • a terminal on the low-potential side of the power storage unit 21 is electrically connected to the ground portion that is provided in the vehicle.
  • the conduction path 22 has one end connected to the conduction path 13 and is a path through which power is supplied from the power source unit 11 to the power storage unit 21 .
  • the conduction path 22 is constituted by conduction paths 22 A and 22 B. One end of the conduction path 22 A is connected to the conduction path 13 , and the other end of the conduction path 22 A is connected to a DC-DC converter 31 , which will be described later. One end of the conduction path 22 B is connected to the DC-DC converter 31 , which will be described later, and the other end of the conduction path 22 B is connected to the power storage unit 21 .
  • the internal resistance detection device 30 functions to detect the internal resistance of the power storage unit 21 .
  • the internal resistance detection device 30 is equipped with the automotive DC-DC converter 31 (hereinafter also referred to as “DC-DC converter 31 ”), a current detection unit 32 , a voltage detection unit 33 , and the control unit 34 .
  • the DC-DC converter 31 is equivalent to an example of a charging circuit unit, and is constituted by a known DC-DC converter.
  • the DC-DC converter 31 is provided on the conduction path 22 .
  • the DC-DC converter 31 is configured with either one of the conduction path 22 A and the conduction path 22 B serving as an input conduction path, the other one of the conduction path 22 A and the conduction path 22 B serving as an output conduction path, and steps-up or steps-down the DC voltage that is applied to the input conduction path and outputs the DC voltage to the output conduction path.
  • the DC-DC converter 31 functions to convert power from the power source unit 11 and supply charging current to the power storage unit 21 .
  • DC-DC converter 31 is configured to raise the output voltage to a target voltage by performing constant current operation in which the charging current is output at a target charging current, and, when the output voltage reaches the target voltage, to control power such that the charging current is lowered by performing constant voltage operation in which the output voltage is fixed at the target voltage.
  • the current detection unit 32 is constituted by a known current detection circuit.
  • the current detection unit 32 is a current detection circuit that detects the current (the charging current supplied to the power storage unit 21 ) that flows through the conduction path 22 B, and may be constituted by, for example, a shunt resistor provided on the conduction path 22 B and a differential amplifier that amplifies the end-to-end voltage of the shunt resistor and outputs the amplified voltage.
  • the control unit 34 specifies the value of the current that flows through the conduction path 22 B based on the value (detection value of the current detection unit 32 ) that is input from the current detection unit 32 .
  • the voltage detection unit 33 functions to detect the output voltage of the DC-DC converter 31 .
  • the voltage detection unit 33 is constituted by a known voltage detection circuit.
  • the voltage detection unit 33 is provided on the conduction path 22 B and detects the voltage that is applied to the conduction path 22 B.
  • the voltage detection unit 33 inputs a value (such as a voltage value of the conduction path 22 B, or a value obtained by the voltage value of the conduction path 22 B being divided by a voltage-dividing circuit) indicating the voltage of the conduction path 22 B to the control unit 34 as a detection value.
  • the control unit 34 can specify the voltage value of the conduction path 22 B based on the value (detection value of the voltage detection unit 33 ) input from the voltage detection unit 33 .
  • the control unit 34 controls the operation of the DC-DC converter 31 and the like.
  • the control unit 34 may be constituted by a microcomputer or the like, and includes an arithmetic device such as a CPU, memory such as ROM or RAM, and the like.
  • the control unit 34 operates with use of power supplied from the power source unit 11 or the power storage unit 21 . Specifically, the control unit 34 .
  • control unit 34 causes the DC-DC converter 31 raise the output voltage to a target voltage by causing the DC-DC converter 31 to perform constant current operation in which the charging current is output at a target charging current, and, when the output voltage reaches the target voltage, causes the DC-DC converter 31 to control power such that the charging current is lowered by causing the DC-DC converter 31 to perform constant voltage operation in which the output voltage is fixed at the target voltage.
  • the control unit 34 functions as a capacity detection unit 34 A and an internal resistance detection unit 34 B.
  • the capacity detection unit 34 A and the internal resistance detection unit 34 B may be realized by software processing with use of an information processing device, or may be realized by a hardware circuit.
  • the capacity detection unit 34 A detects the capacity of the power storage unit 21 .
  • the capacity detection unit 34 A is configured to detect the capacity of the power storage unit 21 based on changes in the output voltage detected by the voltage detection unit 33 due to a predetermined capacity detection time passing when the DC-DC converter 31 is performing constant current operation, and the charging current that is detected by the current detection unit 32 while the capacity detection time passes.
  • the internal resistance detection unit 34 B detects the internal resistance of the power storage unit 21 based on the target charging current during constant current operation performed by the DC-DC converter 31 , drop time, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and the capacity of the power storage unit 21 detected by the capacity detection unit 34 A.
  • the following describes how the internal resistance of the power storage unit 21 is detected by the internal resistance detection device 30 , with use of FIG. 2 .
  • the control unit 34 In response to a predetermined charging condition being established, the control unit 34 is brought into a start-up state from a sleep state and causes the DC-DC converter 31 to perform constant current operation (constant current operation in which the charging current is output at the target charging current).
  • a predetermined charging condition being established may be “the starting switch (such as an ignition switch) of a vehicle having been switched from off to on”.
  • the switch 14 When a predetermined charging condition is established, power is supplied from the power source unit 11 to the load 12 and the power storage unit 21 by the switch 14 operating in conjunction and switching from off to on. In the example shown in FIG.
  • the output voltage of the DC-DC converter 31 before constant current operation is lower than the target voltage, and a value that corresponds to the charging voltage of the power storage unit 21 is detected by the voltage detection unit 33 .
  • the charging current of the DC-DC converter 31 before constant current operation is lower than the target charging current. As shown in FIG. 2 , once a predetermined charging condition is established at a time T 1 and constant current operation of the DC-DC converter 31 is started, the DC-DC converter 31 raises the output voltage to the target voltage by performing constant current operation output at a target charging current Ichg.
  • the output voltage of the DC-DC converter 31 continues to rise from the time T 1 until a time T 5 , at which the output voltage reaches the target voltage. Then, between the time T 1 and a time T 4 , the control unit 34 performs control to detect the capacity of the power storage unit 21 . Specifically, during a time (a predetermined capacity detection time ⁇ t1) from a time T 2 (the time when a small amount of time has passed from the time T 1 ) to a time T 3 , the control unit 34 detects a capacity C of the power storage unit 21 based on the change in the output voltage of the DC-DC converter 31 and the charging current supplied to the power storage unit 21 .
  • a time a predetermined capacity detection time ⁇ t1
  • the control unit 34 detects a capacity C of the power storage unit 21 based on the change in the output voltage of the DC-DC converter 31 and the charging current supplied to the power storage unit 21 .
  • the charging current remains at Ichg (specified charging current), and an electric charge amount Q, which is stored in the power storage unit 21 as the capacity detection time ⁇ t1 passes, is calculated by integrally calculating the charging current Ichg within the span of the time T 2 to the time T 3 .
  • the output voltage that increases as the capacity detection time ⁇ t1 passes is denoted as ⁇ V, and therefore the capacity C of the power storage unit 21 is calculated by dividing Q by ⁇ V.
  • the control unit 34 causes the DC-DC converter 31 to perform constant voltage operation. That is to say, when the output voltage reaches the target voltage, the DC-DC converter 31 controls the power such that the charging current is lowered by performing constant voltage operation that fixes the output voltage at the target voltage. In this way, the charging current of the power storage unit 21 decreases from the time T 5 .
  • the control unit 34 performs control to detect the internal resistance of the power storage unit 21 when the DC-DC converter 31 starts constant voltage operation.
  • the control unit 34 measures a drop time ⁇ t2, which is the amount of time that passes from the time (T 5 ) that constant voltage operation of the DC-DC converter 31 starts to the time when the charging current drops to a predetermined current value.
  • a “predetermined current value” is a current value that is lower than the target charging current, and is pre-set and stored in a memory or the like.
  • the control unit 34 calculates an internal resistance R of the power storage unit 21 based on the target charging current Ichg, the drop time ⁇ t2, and the capacity C of the power storage unit 21 calculated during constant current operation.
  • the control unit 34 goes into a standby state from the time T 6 .
  • FIG. 3 is a graph showing an example of the changes over time of the output voltage of a DC-DC converter 31 and the charging current in an in-vehicle power source system of a conventional example.
  • processing to detect the internal resistance is performed during constant current operation in which a constant charging current is supplied to a power storage unit. That is to say, the supply of charging current is stopped when the output voltage has increased (at a time T 25 in FIG. 3 ), and the internal resistance of the power storage unit is calculated based on a reduction value ⁇ Vd of the output voltage and a reduction value ⁇ I of the charging current occurring at that time. Specifically, the value of the internal resistance is calculated by dividing ⁇ Vd by ⁇ I. Then, after a predetermined amount of time has passed (when a time T 26 is reached) from the time T 5 , the charging of the power storage unit is restarted.
  • the control unit 34 detects the capacity of the power storage unit 21 during constant current operation before constant voltage operation by the DC-DC converter 31 . For this reason, it is possible to perform capacity detection that reflects the state (temperature characteristics and the like) of the power storage unit 21 immediately before detecting the internal resistance thereof and is highly accurate. Also, it is possible to more accurately detect the internal resistance of the power storage unit 21 by using the capacity thereof that is precisely detected.
  • the control unit 34 of the internal resistance detection device 30 described above detects the internal resistance R of the power storage unit 21 based on the target charging current Ichg during constant current operation by the DC-DC converter 31 , the drop time ⁇ t2, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and the capacity C of the power storage unit. For this reason, the target charging current Ichg during constant current operation by the DC-DC converter 31 , the drop time ⁇ t2, which is the time that passes from when constant voltage operation starts to when the charging current drops to a predetermined current value, and the capacity C of the power storage unit can be reflected and the internal resistance R of the power storage unit 21 can be accurately detected.
  • control unit 34 detects the internal resistance R of the power storage unit 21 based on the drop time ⁇ t2 and the current that is detected after constant voltage operation is started by the DC-DC converter 31 , and therefore the control unit 34 can use the time of constant voltage operation performed by the DC-DC converter 31 to detect the internal resistance R of the power storage unit 21 .
  • the control unit 34 can use the time of constant voltage operation performed by the DC-DC converter 31 to detect the internal resistance R of the power storage unit 21 .
  • the internal resistance detection device 30 can detect the internal resistance of the power storage unit 21 efficiently and accurately.
  • the internal resistance detection device 30 is configured to include a voltage detection unit 33 configured to detect the output voltage of the DC-DC converter 31 .
  • the internal resistance detection device 30 is configured to include a capacity detection unit 34 configured to detect the capacity of the power storage unit 21 based on changes in the output voltage detected by the voltage detection unit 33 due to a predetermined capacity detection time passing when the DC-DC converter 31 is performing constant current operation, and the charging current that is detected by the current detection unit 32 while the capacity detection time passes.
  • the control unit 34 detects the internal resistance R of the power storage unit 21 based on the target charging current Ichg, the drop time ⁇ t2, and the capacity C of the calculated power storage unit 21 .
  • the capacity of the power storage unit 21 can be detected by the control unit 34 based on the change of the output voltage detected by the voltage detection unit 33 and the current detected by the current detection unit 32 . For this reason, it is possible to perform capacity detection that reflects the state of the power storage unit 21 immediately before detecting the internal resistance thereof and is highly accurate. Also, it is possible to more accurately detect the internal resistance of the power storage unit 21 by using the capacity thereof that is precisely detected.
  • the control unit 34 uses the capacity of the power storage unit 21 calculated during constant current operation of the DC-DC converter 31 , but configurations are also possible in which the capacity calculated during the previous internal resistance detection is used, or a capacity value is used that has been pre-set and stored on a memory or the like.
  • the starting switch (such as an ignition switch) of a vehicle being switched from off to on is taken “a predetermined charge starting condition being established”, but the charging voltage of the power storage unit 21 falling to or below a predetermined charging voltage may also be taken as “a predetermined charge starting condition being established”.
  • the switch 14 operates in conjunction with the starting switch of the vehicle and switches between on and off, but configurations are also possible in which the switch 14 is the starting switch (such as an ignition switch) of the vehicle.
  • the control unit 34 when charging is performed by the DC-DC converter 31 , the control unit 34 performs control to detect the capacity of the power storage unit 21 while charging current of a constant current value is supplied to the power storage unit 21 .
  • a charging current of a current value that is not constant is supplied when control is performed to detect the capacity of the power storage unit 21 .
  • the electric charge amount Q stored in the power storage unit 21 is calculated by integrally calculating the charging current within a predetermined timespan.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
US17/266,359 2018-08-22 2019-08-01 Internal resistance detection device and power source device Active 2040-11-30 US11843096B2 (en)

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JP2018155223A JP7042413B2 (ja) 2018-08-22 2018-08-22 内部抵抗検出装置及び電源装置
PCT/JP2019/030241 WO2020039881A1 (fr) 2018-08-22 2019-08-01 Dispositif de détection de résistance interne et dispositif d'alimentation électrique

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US20210311100A1 (en) 2021-10-07

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